const portal = new BillwerkJS.Portal(selfServiceToken)
const updatePayment = () => {
          return this.paymentForm.processPaymentData(
            null,
            this.contractCurrency,
            paymentData => {
              paymentData.returnUrl = returnUrl
              // console.log(paymentData)
              portal.paymentChange(null, paymentData, handlePaymentUpdate, error => {
                // console.log(error)
                promise.reject(this.convertBillwerkError(error))
              })
            },
            error => {
              promise.reject(this.convertBillwerkError(error))
            }
          )
        }